China weighed in on Wednesday with its own, albeit indirect, criticism of a proposal by leading US Republican presidential candidate Donald Trump to ban Muslims from entering the United States.

Trump called for blocking Muslims, including would-be immigrants, students, tourists and other visitors, from entering the country following last week's California shooting spree by a Muslim couple who authorities said had been radicalised.

His remarks have already been widely criticised both in the United States and around the world.

Chinese Foreign Ministry spokeswoman Hua Chunying said what Trump said was really an internal issue for the United States, and she could not comment on internal U.S. matters.

"But on the relevant issue he brought up, China's position is very clear," she told a daily news briefing in Beijing.

"China opposes all forms of terrorism. We uphold that the international community should make a concerted effort to fight terrorism, and at the same time we have always opposed linking terrorism to any specific ethnic group or religion," Hua added, without elaborating.

China is home to a large Muslim population of about 20 million people, including Uighurs in the far western Chinese region of Xinjiang, where the government says it is facing its own problem with radicalised Islamists.

Rhythm Media Group is a multi-media company, operating a US-based Chinese daily newspaper, The China Press, and the paper's website - uschinapress.com (which has mobile-app version), as well as a Beijing-based English website Sino-US.com. The group boasts 15 branch offices across the US, and a number of cultural centers focusing on culture-related business in the North America, Chinese mainland, Hong Kong and Taiwan.Launched in September 2012, the Sino-US.com is designed to serve as a bridge between China and the US, and to keep its readership inside or outside China better informed by providing news and insights on China's current affairs, culture, life, business, people and sports.